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IX. Coal Mine Waste - Rule 4.11 <br />Non -coal processing waste narrative may be found in Section of 2.05, Volume 1. Underground <br />development waste rock pile and specifications are documented in Volume 6A. <br />The operator's plan for non -coal processing waste disposal on site was in compliance with the <br />regulations. Non -coal processing waste such as paper trash, garbage, scrap metal, and other <br />non - hazardous waste was disposed of at the Delta County Landfill. <br />X. Backfilling and Grading - Rule 4.14 <br />BRL's application for a permit for the Bowie No. 1 East Mine proposed a reclaimed final <br />configuration for the surface facilities areas of the mine which consists of a partial backfilling <br />scheme. In the preliminary adequacy review of the original permit application, the Division <br />stated that it considered their proposal to be inadequately supported within the application. <br />Further, the Division required the applicant to complete an appropriate geotechnical and stability <br />analysis to demonstrate that the proposed final configuration would be stable and would satisfy <br />the requirements of Rules 4.14 and 4.27, "Operations on Steep Slopes." The results of the <br />analyses would then be utilized by the applicant to prepare a detailed engineering design which <br />conformed to the above regulations. <br />The operator retained the services of Merrick and Company and Geo -Hydro Consultants, Inc. to <br />investigate the slope stability of the entire surface facilities area at the Orchard Valley (Bowie <br />No. 1) Mine. Phase I of this study was completed and a summary report, prepared by <br />Geo -Hydro Consultants, Inc., was submitted to the Division for review on July 21, 1981 (See <br />Volume 6). The analysis, prepared in accordance with the present state -of -the -art of <br />geotechnical analysis, determined that no immediate major hazards existed at the mine site. The <br />report does observe, however, that some local stability problems exist and the factors of safety of <br />individual cuts and fills will have to be increased by redesign and reconstruction to achieve a <br />stable final reclaimed configuration, in accordance with the regulations. <br />Geo - Hydro, Consultants, Inc. completed the Phase II analyses on April 15, 1982, in accordance <br />with the stipulated requirements of the originally approved Permit (See Volume 6). The <br />stipulated tasks of the Phase II analyses included evaluation of nearby landslides mapped by the <br />Colorado Geological Survey, completion of test drilling and test pits, installation of monitor <br />wells, soil and rock testing, and the completion of a series of stability analyses for current slope <br />configurations of the existing surface facility area at the Bowie No. 1 Mine. <br />The operator, in conformance with recommendations made by its geotechnical consultants, has <br />installed sophisticated tilt- metering devices within several of the fill benches which exist within <br />the surface facilities at the Bowie No. 1 Mine. The purpose of these devices is to collect <br />additional geotechnical data with which to verify past analytical assumptions and with which to <br />complete final analysis and design, originally stipulated as Phase III of the surface facility <br />studies, within the approved original permit. <br />Utilizing the results of Geo- Hydro, Consultants, Inc.'s analyses, Merrick & Company, Inc., <br />design consultant to the operator, completed a Phase II amended design for the drainage facilities <br />at the existing surface facility area of the Orchard Valley (Bowie No. 1) Mine. The operator also <br />completed a detailed stability analysis and redesign of the proposed final reclaimed configuration <br />Page 29 of 42 <br />